Detroit Zoo: Zoo Boo, a festively decorated half-mile trick-or-treat trail, greeters will pass out goodies to kids and a trail of eerie fog will lead through a spooky graveyard to the Haunted Reptile House, 6-8 p.m. Oct. 12-14, 19-21 and 26-28, rain or shine. Advance tickets can be purchased at Booth One at the front of the zoo or online at www.detroitzoo.org/events/zoo-boo. Tickets are $7 per person ages 2-up. Time slots are 6, 6:30, 7, 7:30 and 8 p.m. with (5 and 5:30 p.m. Oct. 27 time slots added for advance purchase only. A limited number of tickets may be available at the gate on event days after 5 p.m. for $10. 248-541-5717, www.detroitzoo.org.

Downtown Royal Oak: 29th annual Spooktacular, parents are invited to bring their children in their Halloween costumes to go trick-or-treating for candy and goodies at participating businesses, special sales and kids’ activities, 2-4 p.m. Oct. 28. www.downtownroyaloak.org.

Ferndale Public Library: Halloween Extravaganza, event with an “Aliens vs. Robots” theme, concert by local musician CARJACK, wear your favorite costume and trick or treat inside the library through 8:30 p.m. but beware of robots and aliens at every turn, open to kids of all ages, no registration required, 7 p.m. Oct. 27. 222 E. Nine Mile Road, Ferndale. 248-546-2504.

Royal Oak Public Library: Celebrate Pumpkins, elementary and preschool students will learn about pumpkins through science and math projects, decorate a pumpkin to take home and listen to pumpkin music and poetry, 7 p.m. Oct. 23, free, registration limited to 30. 222 E. 11 Mile Road, Royal Oak. 248-246-3725, ropl.org.

Royal Oak Public Library: Teen Halloween Happenings, middle and high school students are invited to an evening of crafts, games, and snacks like vampire cupcakes and zombie marshmallow treats, wear a costume and dance to (or just watch) Michael Jackson’s “Thriller” video, 6:30 p.m. Oct. 25, free, registration requested. 222 E. 11 Mile Road, Royal Oak. 248-246-3725, ropl.org.

Royal Oak Public Library: Funtastic Halloween, a merry, not scary, time for free games, crafts and activities, wear a costume or come as you are, noon-2 p.m. Oct. 27, no registration required. 222 E. 11 Mile Road, Royal Oak.

Southfield Civic Center: Halloween Happiness for individuals with disabilities ages 18 and over for an evening of dancing, pizza and refreshments. Participants may wear costumes if they like. Cost is $8 per person if registered by Oct. 18 or $10 per person if registered after Oct. 18. Pre-registration is required. Registration form available at www.DestinationOakland.com. Event runs from 6:30-8:30 p.m. Oct. 23, 26000 Evergreen, Southfield. 248-424-7081 or email rigley@oakgov.com.

Troy Historic Village: The Magic of Halloween, trick-or-treating from building to building, The Amazing Clark Magician, 1-3 p.m. Oct. 27, $5 for adults, $3 for seniors and free for costumed trick-or-treaters 12 and under when accompanied by an adult. Park at Zion Church, 3668 Livernois, Troy, and ride the free shuttle.

Troy Nature Center: Trick or Treat Among the Trees, put on a costume and hike the woodland pumpkin trail with a guide, learn secrets of the forest, receive treats and meet costumed characters, 6-8 p.m. Oct. 20, geared for children ages 3-9 with a parent or grandparent. $13 at the door, $11 in advance and $9 for nature center members. The adult guardian is free and must accompany the child throughout the program. 6685 Coolidge, Troy. 248-688-9703.

Troy Public Library: Milk Jug Monsters, make a milk jug monster to use for trick-or-treating or just as a scary fixture for your porch or window this Halloween season, 7 p.m. Oct. 22, ages 5-up. 510 W. Big Beaver Road, Troy. 248-524-3542.